code: def test_zero(self):
      with pytest.raises(ValueError):
          metrics.mape(self.series1, self.series1)
  
      with pytest.raises(ValueError):
          metrics.smape(self.series1, self.series1)
  
      with pytest.raises(ValueError):
          metrics.mape(self.series12, self.series12)
  
      with pytest.raises(ValueError):
          metrics.smape(self.series12, self.series12)
  
      with pytest.raises(ValueError):
          metrics.ope(
              self.series1 - self.series1.pd_series().mean(),
              self.series1 - self.series1.pd_series().mean(),
          )
  
imports: import numpy
  import pandas
  import pytest
  from darts import TimeSeries
  from darts.metrics import metrics
label_desc: Use image node_id 1 for calling the TestMetrics obj's underlying member method code with example usage: obj.test_zero() without return types